Rotary drying-machine.



PATENTED JULY 7, 1908.

W. SCHWARTZ.

ROTARY DRYING MACHINE.

APPLICATION FILED NOV. 22, 1906.

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ROTARY DRYING MACHINE;

' APIfLICATION FILED NOV. 22, 1906.

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OF PHILADELPHIA, II]NNSYLV.-\NI:\, ASSIGNOR 'lU 'lI'II'J PHILADEL- PHIA TEXTILE MACHINERY COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPO- RATION OF PENNSYLVANIA.

ROTARY DRYINGJVIACHINE.

Specification of Letters Patent.

Patented July 7, 1908.

Application filed November 22, 1906. Serial No. 344,527.

To all whom it may concern:

Be it known that i, WALTER M. sci-rwiurrz, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented cer.ain Improvements in Rotary 'Drying- Machines, of which the following is a speciti cation.

The object of my invention is to construct a rotary drying machine in such a manner that air will circulatetransversely through the material as it passes through the cylinder of the drying machine.

My invention is particularly adapted for drying grain, wood chips for pulp manufacture, tobacco and other material which is capable of traveling over a perforated or a gauze surface.

In the accompanying drawings: Figure l, is a longitudinal sectional view of my improved rotary drying machine on the line 1-l Fig. 2, the cylinder being in elevation; Fig. 2, is a sectional plan view on the line 22, Fig. 3, the cylinder being in outside view; Fig.1 3, is a transverse sectional view on the line 33, Fig. 2; Fig. 4, is a view showing part of a perforated cylinder; and Fig. 5, is a view of a modification showing the cylinder provided with a series of longitudinally arranged blades.

I'Ieretofore in rotary drying machines, it has been usual to allow the material to flow by gravity throu h a cylinder having a solid Wall 01 casing and the air was introduced into one end of the cylinder and allowed to escape at the opposite end. 'lhe great objection to this construction is that the moist air does not escape until it has traversed the entire length of the cylinder but by my invention the moist air can imnnaliately escape if necessary or it can be reheated so that the material is sub'octed constantly to a current of air heated to any degree desire-1i.

Referring now to the drawings, A is a casing made of any suitable material. I5 is the drying cylinder arranged at a slight incline. 'lhe incline will depend considerably upon the material being dried. The cyliw der consists of a series of annular rings 11 flanged as shown in Fig. I and a cylindrical body b of wire gauze, the mesh of the wire gauze being of such size as to prevent the material being dried from passing through it. In place of wire gauze th cylinder may be made up of perforated plates '2 a shown s Fig. 4, the perforations being of such size as to prevent the passage of the material, being dried, through the perforations.

Q, (I are two longitudinal shafts on which are rollers c, (1. These. rollers are grooved and the flanges of the rings of the cylinders are mounted in the grooves of the rollers. 'lhe shafts C are mounted in bearings (1 carried by the. supports a, a forming part of the framework of the machine. The two shafts are placed a given distance apart so as to properly support the cylinder 13 and when motion is imparted to the shafts, the cylinder will be driven. 'lhe cylinder can be driven in either direction depending considerably upon the material being dried. In the present instance the two shafts (I are geared to a driving shaft C by means of a worm c, and worm wheels 0 so that the cylinder is rotated slowly.

I is the feed hopper for feeding the material into the cylinder and F is the discharge rout through which the material is discliarged from the cylinder.

f is an apron depending from the frame and so arranged as to allow the material to escape but will prevent the ingressof air to the interior of the drier.

.It will be noticed in referring to Figs. 2 and 3, that the drying cylinder is in the compartment A of the casing A and the heating pipes for heating the air are in the compartment A at one. side of the. compartment A. G are heating pipes and I), I) are circulating fans, each mounted on a shaft I) adapted to bearings d in the frame of the machine. The fans are mounted in openings in the parti tion a separating the drying compartment A from the. heating compartmcnt A. The partition (1 stops short of the top as indicated in Fig. 5%, so as to allow a clear passage (1 for the air to pass from one chamber to the other. l lo the present instance I have shown a drying machine in which two sets of fans are i used but it will be understood that my invenlion ran be embodied in a machine. in which a single fan or more than two fans can be used depending considerably upon the quantity of material to be. dried.

In the roof of the drying chamber A is an opening a to carry oil the moist air and this opening communicates with a line l in which i a damper to regulate the How of the moist to escape through the air from the machine, and I is an exhaust fan mounted on a driven shaft 1.

J, J are air inlet openings provided with doors j to regulate the admission of fresh air to the drier.

As the air circulates in the machine, it is reheated and a certain roportjon is allowed ue 1, fresh air being admitted through the opening J or through the ends of the cylinder.

I preferably arrange a vertical partition a in the drying chamber A directly under the drum B so as to direct'the air to the drum In the presentr instance the drum is driven in the direction indicated by the arrow 1, Fig. 3, so that the material Will accumulate on the right ide of the drum looking in the direction indicated by Fig. 3, allowing the air to pass through the body of material as it is carried up by the action of the drum.

It will be understood, however, that the direction of rotation of the drum may be reversed if desired and in which case, I may dispense with the vertical partition a some instances also a drum may be used as indicated'in Fig. 5, having series of longituiral, which tend to carry the material up eside of the drum and allow it to fall in thin sheets as the air is blown through it.

e o eration of the machine is as folloWs;- e material is fed to the he per E preferably in a continuous stream an into the cylinder B, it is fed slowly forward in. the cylinder and travels up its side as indicated in Fig. 3. The heated air is forced by the fans D into the compartment A through the meshes or perforations in the cylinder B, and through the material, carrying off the moisture in the material, a tion of the air returning immediately to the compartment A where it is re-heated, While dinally arranged blades 5 either strai ht or s t a small percentage is drawn oh by the 6X-' haust fan I. Thus the material to be dried is subject to a continuous blast of heated air and by the time it reaches the discharge end of the drum the material is thoroughly dried. Bfy this means I am enabled to maize a drum ograny length desired Without changing its eniciency, and the capacity increases in proof the cylinder.

portion to the length passes his type of drier I can treat the material at high temperature at first if desired and as the material loses its moisture i can reduce the temperature as it nears the outlet, or vice yersa. This cannot be accomplished in the ordinary rotary drier.

l. claim:'--

i. The combination in a drying machine, of a longitudinal partition forming two compartments, heating mechanism in one compartment, a longitudinally arranged cylinder in the other compartment, said cylinder having a perforated shell, means for rotating the shell, an opening in the lower part of the partition at the side or the shell, an opening in the upper portion of the partition, a fan in the lower opening, said fan being situated close to the cylinder, means longitudinally disposed beneath said cylinder for directing the air through that portion of the shell carrying the body of material, the air having an uninterrupted flow from the fan directly to the cylinder so that its force will not be expended before reaching the material in the cylinder, substantially as described.

2. The combination in a drying machine, of a casing, a partition separating the casing into two compartments, heating mechanism in one compartment, a longitudinally arranged perforated cylinder in the other compartment, means for rotating the cylinder, an opening in the lower part of the partition and an opening in the 11 per part of the par-- tition, whereby air Wi l circulate through both. compartments, a fan in the lower open ing for circulating the air from the heating compartment into the lower portion of the drying compartment in which the cylinder is mounted, a vertically arranged longitudinal partitiondirectly under the. cylinder, Where y the air as it is forced into the drying compartment by the fan is caused to flow through that portion of'the cylinder nearest the fan, substantially as described.

In testimony whereof, I have signed my name to this specification, in-the presence of two subscrihin Witnesses.

WALTER M. SCHWARTZ.

c r KLEIN. D'

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